Donald Trump is taking one final jab at Hillary Clinton before tonight’s debate, via Snapchat. On Monday, the Republican candidate’s campaign launched a nationwide custom Snapchat filter that refers to his opponent as “Crooked Hillary.” SEE ALSO: Insult after insult: All of Trump’s ugly campaign rhetoric in one place The “Debate Day” filter, a possible appeal towards millennial supporters, allows Snapchat users to adorn their photographs and videos with the words “Donald Trump vs Crooked…